Slip clutch power take-off unit



Jan. 11, 1949. c. DPETERSQN ET'AL" 1,459,092

SLIP-CLUTCH POWER TAKE-OFF UNIT Filed A ril 19, 1945 -2 Sheets-Sheet 1 INVENTORQ C HEL D. PETERSON By m BEETHDE/MEL ATTOR 5 Patented Jan. 11, 1949 SLIP CLUTCH POWER TAKEFOFF'UNITIT.

Carl ll Petersom Albert H. Deimel andtGarl iH Wdleott, Toledo, Ohio, assignors to Danae." poration,i. 'lioledo, Ohio, a corporatioitrof :Nu'ai ginia Application April- 19; 1945, Serial Ma -589338 2 Claims..\ (Cl. 747.?1-5-86JWF This invention relates ,tipQWer- -,-itake offs for transmission 'mechanisms; and -has :for its zobject.

a power take oif which, is h gfticlllaifly Compact and strong in construction and-readily applied to the geai abcx of a transmissinntnnechanism.,and which; embodies aicomnact. overloadrelease-pour pling requiring minimum of essential space in an axial direction of the transmission.

A power take off embodying this clutch is particularly applicable for use in connection with a hydraulic torque converter transmission Where the torque multiplication is high, as for instance, a transmission mechanism of the type shown in Peterson and Deimel Patent No. 2,369,369 issued February 13, 1945.

The invention consists in the novel features and in the combinations and constructions hereinafter set forth and claimed.

In describing this invention, reference is had to the accompanying drawings in which like characters designate corresponding parts in all the views.

Figure 1 is a longitudinal sectional view through the power take off, the contiguous portion of the casing and a gear on the output shaft of the transmission mechanism being also shown.

Figure 2 is an enlarged sectional View taken on the plane of line 2-2, Figure 1, through the overload release coupling.

This power take off unit includes, generally, a casing or box, having drive and driven shafts therein, which are usually arranged at an angle to each other, a drive gear for meshing with a gear on the output shaft of the transmission mechanism, an overload release coupling between the drive shaft and said gear and a manually operable clutch for clutching the drive and driven shafts together at will.

i designates the casing or box which may be of any suitable construction, it being preferably made of one piece with the exception of openings for the bearings for the shafts therein and an opening, as 2, for registering with an opening in the gear box of the transmission mechanism,to which the unit is applied, in order that the drive gear of the power take off unit may coact with a gear, as 3, on the output shaft of the transmission mechanism.

l designates the casing or box of the transmission mechanism to which the unit is applied.

1! and I2 designate respectively the driving and driven shafts of the unit, these being arranged at an angle to each other and journalled in bearings in the casing l. The shafts It and it are provided respectively with intermeshing 2 bevelzzgears: t3 andnlz l athelgears-iitzonthe driver:- shaft 51'! I ;';being;; rotatably;- mounted theteonepan clutchableotheretos-ai I Eedesignates :the; drive :gea 1:; of .qtherunit, thiszibeingimounteds concentric-.vvi-th1v theidr-ivershaftitlz and connected-stheretoxthrough:ra

anioverloadi'releasei (QOIIIBMHQRQLASIFIIBIZQ z shown;. it is a slip; rim ;.on:ta .hubinl 6.; splinedaonl.theadrivei shaft II, the gear extending through the opening 2 into the gear box for the transmission mechanism for meshing with a gear as 3 on the. output shaft of the transmission mechanism. The gear I3 is connected to the hub It to slip under a predetermined overload, and as here shown the bore of the gear I5 is formed with internal transverse grooves or notches ll having inclined or cam-shaped sides l8, and the hub i6 is formed with a series of equally spaced radial bores it in which spring loaded poppets as balls 20 are located, the balls normally seating in grooves 51. The springs are selected or loaded to apply a predetermined resistance and to compress under the camming force of the sides It of the grooves ll. Obviously, when the load becomes greater relatively to the driving torque, the

; slip rim gear l5 will slip, until the driving and load forces are again equal.

The gear I3 is clutched to the drive shaft 2 by a shiftable toothed clutch collar 2! splined on the inner end l3 of the shaft II in the space intersected by the axes of the angularly arranged shafts H, l2. The clutch collar 2! is shiftable into and out of clutching engagement with internal teeth 22 in a recess in the gear I3 and is shifted in any suitable manner, as by a shift rod 23 having a fork 24 thereon working in a peripheral groove in the collar 2|. The shift rod 23 extends through a wall of the casing and its outer end may be connected to a suitable remotely located shift lever within reach of the operator or driver of the vehicle in which the transmission mechanism is installed. The bearings for the shaft H, in addition to the bearings 25 in an end wall of the box, also include a bearing 26 between the overload clutch and the gear [3. The inner end of the shaft II on which the clutch collar is mounted overhangs, and owing to the arrangement of the bearings 25 and 26 and the overload clutch, the drive shaft l l is firmly mounted against developing looseness and misalignments and also the entire unit is compact inan axial direction, as Well as sturdy in construction.

What we claim is:

1. A power take off unit for transmission mechanisms, the unit including a casing having drive and driven shafts journalled therein, the shafts being arranged at an angle to each other, intermeshing gears on said shafts, the gear on one shaft being rotatably mounted thereon and clutchable thereto, a manually operable clutch mounted on the said one shaft and shiftable to clutch and unclutch the gear thereon and said one shaft, a drive gear for the drive shaft and for meshing with a gear on the output shaft of the transmission mechanism, and an overload release coupling between the drive shaft and the drive gear, the manually operable clutch being located in the space at the intersection of the axes of the drive and driven shafts.

2. A power take off unit for transmission mechanisms," the unit including a casing having drive 4 shaft of the transmission mechanism and an overload release coupling between the drive shaft and the drive gear, the casing having bearings for the drive shaft, one being between the overload release coupling and the gear rotatably mounted on the drive shaft and clutchable thereto.

CARL D. PETERSON. ALBERT H. DEIMEL. CARL H. WOLCOTT.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,449,572 Zuhars et al Mar. 27, 1923 1,476,886 Haubert Dec. 11, 1923 1,786,067 Horste Dec. 23, 1930 1,876,561 Brown Sept. 13, 1932 2,164,870 DeSalardi July 4, 1939 2,287,279 Stumpf June 23, 1942 FOREIGN PAIENTS Number Country Date 464,848 Germany Aug. 28, 1928 

